Extreme Orientational Uniformity in Large-Area Floating Films of Semiconducting Polymers for Their Application in Flexible Electronics

• DOI: 10.1021/acsami.1c09671
• Publication Date: 2021-08-06T16:35:27Z
• Authors: Manish Pandey; Heriyanto Syafutra; Nikita Kumari; Shyam S. Pandey; Ryo Abe; Hiroaki Benten; Masakazu Nakamura
• Keywords: Organic Electronics

Layer-by-layer fabrication of uniformly oriented thin films over large areas by cost-effective solution-based approaches can open new horizons for the realization high-performance organic circuits in various applications. In this work, a large-area ≈40 cm2 film with uniform orientation is reported poly(3,3‴-dialkylquaterthiophene) (PQT) using unidirectional floating transfer method (UFTM). Orientation characteristics and charge transport anisotropy were analyzed polarized UV–vis spectral mapping bottom-gated field-effect transistors (OFETs) from different regions. Films found to be highly an optical dichroic ratio ca. 15. reveal that along width film, covering >70% area, angle-dependent mobilities are good agreement polymer backbones. These resulted 8.9. An array OFETs fabricated length single (≈15 × 2.5 cm2) demonstrated average mobility 0.0262 cm2/(V s) very narrow standard deviation 12.6%. We also thickness easily tuned 5.6 45 nm increasing PQT concentration, reproducible even when 10 nm. Microstructural characterization thus-prepared revealed edge-on stacked backbones surface roughness <1 as probed grazing incidence X-ray diffraction atomic force microscopy, respectively. Flexible bottom-gate top-contact geometry fabricated, having 0.0181 s). There was no considerable change after bending flexible devices at radii.